1. Plural of polystyrene; synthetic plastic polymers made from the monomer styrene, used widely in packaging, insulation, and consumer products.
Usage: Countable noun when referring to different types or batches; often used in industrial and manufacturing contexts.

Examples

• The factory produces several different polystyrenes for various applications.
• Polystyrenes are commonly used in foam cups and takeout containers.
• Recycling programs now accept certain polystyrenes to reduce plastic waste.
• Different polystyrenes have varying densities and thermal properties.
• The company specializes in manufacturing high-grade polystyrenes for electronics packaging.
• Polystyrenes are valued for their lightweight and insulating qualities.